TETSUBottoms-Up vs Ghd Sit-Up
The Bottoms-Up and the Ghd Sit-Up both train the abs as their primary muscle. The Bottoms-Up is bodyweight-only while the Ghd Sit-Up uses a machine. Here is how they compare and when to pick each.
Side-by-side comparison
| Bottoms-Up | Ghd Sit-Up | |
|---|---|---|
| Primary muscle | abs | abs |
| Body part | waist | abs |
| Supporting muscles | obliques and hip flexors | — |
| Equipment | bodyweight | machine |
| Steps in our guide | 5 | 5 |
How each one starts
Bottoms-Up — first steps
- Lie flat on your back with your legs extended and your arms by your sides.
- Bend your knees and bring them towards your chest, keeping your feet off the ground.
Ghd Sit-Up — first steps
- Sit on the GHD with your feet secured and hips just off the front of the pad.
- Lower your torso backward with control; shorten the range while learning.
Full step-by-step guides are linked below.
Which should you choose?
The Bottoms-Up needs no equipment and scales through leverage, tempo and reps. The Ghd Sit-Up fixes the movement path so you can push close to failure with less skill demand. If your gym has both options, neither is a wrong choice: pick the one that feels strongest through a full range, and swap after 6 to 8 weeks to keep the abs adapting.
Full form guides
Common questions
Is the Bottoms-Up better than the Ghd Sit-Up?
Neither is universally better — both train the abs as the primary mover. The Bottoms-Up needs no equipment and scales through leverage, tempo and reps, while the Ghd Sit-Up fixes the movement path so you can push close to failure with less skill demand. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Bottoms-Up and the Ghd Sit-Up in the same program?
Yes, but usually not in the same session — they overlap heavily on the abs. A common setup is one as your main movement and the other on a second training day, or alternating them block by block.
Do the Bottoms-Up and the Ghd Sit-Up work the same muscles?
The primary muscle is the same: the abs. Supporting muscles differ slightly — obliques and hip flexors for the Bottoms-Up versus minimal assistance for the Ghd Sit-Up.
Track it in Tetsu
Tetsu tracks both movements separately, keeps your PRs per exercise, and tells you which one is actually progressing. Free to start.